SP101
SP101 with Corbon load data
Type	Revolver
Place of origin	United States
Production history
Manufacturer	Sturm, Ruger & Co.
Produced	1989–present[1]
Variants	See Models
Specifications
Mass	25–30 oz (710–850 g)[2]
Length	7.2 in (18 cm) 8 in (20 cm) 9.12 in (23.2 cm)[2]
Barrel length	2.25 in (5.7 cm) 3.06 in (7.8 cm) 4.2 in (11 cm)[2]
Cartridge	.22 LR .38 Special .357 Magnum .327 Federal Magnum 9×19mm .32 H&R Magnum (discontinued)
Action	Double-action revolver
Effective firing range	33 to 55 yards (30 to 50 meters)
Maximum firing range	550 yards (500 meters) +/−
Feed system	5/6/8-round cylinder[2]

The Ruger SP101 is a series of double-action revolvers produced by the American company Sturm, Ruger & Co. The SP101 is a small frame and all-steel-construction carry revolver, with a five-shot (.38 Special, .357 Magnum, and 9×19mm Parabellum); six-shot (.327 Federal Magnum, and .32 H&R Magnum); or eight-shot (.22 LR) cylinder.

The Ruger SP101 was introduced in 1989 as the smaller-frame counterpart to the GP100. Together, these revolvers replaced Sturm, Ruger & Co's long-standing staple in the American firearms market, the Ruger Security-Six series revolvers. A 9 mm version was available until its discontinuation around 1998 but was later re-released in early 2018. A basic .22 LR version was also available until 2003 while a redesigned version was introduced in 2011.^[3]

• The SP101 is currently manufactured in .327 Federal Magnum, .357 Magnum, 9 mm, .38 Special, and .22 LR.^[4]
• Barrel lengths 21⁄4" (57.15mm), 31⁄16" (77.79mm), and 41⁄5" (106.7mm) with full underlugs. 4" (101.6mm) and 41⁄5" (106.7mm) with half underlug.
• Stainless steel construction
• Transfer bar safety mechanism
  • Firing pin mounted in frame
  • The transfer bar in the SP101 is connected directly to the trigger
• Fixed (all calibers) or adjustable (.327 Federal Magnum, .357 Magnum, and .22 LR) sights
• Spurred or spurless (double-action only) hammer

• Weight:
  • 21⁄4", 251⁄2 oz. (708 g)
  • 31⁄16", 27 oz. (765 g)
  • 41⁄5", 22 LR: 30 oz. (850 g), .327 Federal Magnum: 29.5 oz (836 g), and .357 Magnum: 29.5 oz.(836 g)
• Barrel lengths: 21⁄4" (57.15 mm), 31⁄16" (77.79 mm), 4" (101.6mm)
• Double-action/single-action
  • Double-action-only on select models
• Five-shot (.38 Special, .357 Magnum, 9×19mm Parabellum), six-shot (.327 Federal Magnum, .32 H&R Magnum), eight-shot (.22 LR)
• Maximum effective range: 33 to 55 yards (30 to 50 meters) depending on barrel length and cartridge load^{[citation needed]}

• All models are made of stainless steel
• Caliber: .357 Magnum SP101s handle all .357 Magnum factory loads and accept factory .38 Special cartridges
• Spurless-hammer models (double-action only) are designated by an "L" in their catalog numbers

•  United States
  • New York Police Department SPNY Double Action Only (DAO) .38 Special made specifically for the NYPD as a backup gun, off-duty, or Detective use. ^[9][10]

• Ruger's SP101 page
• Ruger SP101 -- A Sturdy Rimfire "Secret" by Clair Rees, Guns

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